Major Problem with Aura One

This morning, however, things have gone decidedly pear-shaped. After copying a number of documents onto the device, the Aura is now completely locking up for about 5 minutes then going into a reboot cycle for about ten minutes before finally loading again and then immediately freezing and starting the whole cycle again.

I cannot get control at any point, and there does not appear to be any way of performing a hardware reset . Anyone got any ideas?